Small footprint with large white LED digits that are easy to read day or night, and the screen brightness can be easily adjusted from 0-100%, depending on personal preference. Optional 12 or 24 hour time display. Choose your favorite sound from 5 alarm sound options (beep/buzzer/bird sound/piano music/soft music) and wake up with adjustable alarm volume from 30-90db. Easy to use digital alarm clock. Repeat easily with a simple press of the top button and feel no stress when setting the time or alarm. Built-in USB port charges your compatible smartphone while you sleep. Start your day fresh with a fully charged phone. BATTERY BACKUP - Powered by an outlet, but you have the option of backing it up with 3 AAA batteries (NOT included) in the event of a power outage. Not only the time and settings are restored, but the alarm is also supported (USB does not charge). Please note that the clock can drain the batteries quickly, so use it ONLY as a backup, NOT for everyday use. Product Size: 15cmx7cmx3.6cm. Color: Black. Quantity Shipped: 1 piece.